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Cost of revenues and general and administrative expenses - General and administrative expenses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | $ 19,348,958 | $ 18,709,419
Employee costs [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 9,335,247 | 8,400,729
Insurance [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 866,457 | 751,541
Professional fees [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 1,178,621 | 1,250,634
Directors' fees and expenses [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 969,279 | 845,891
Depreciation [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 139,817 | 186,790
NSC project expenses [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 2,343,249 | 2,855,827
Amortization of intangible assets [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 841,667 | 1,340,000
Other [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | $ 3,674,621 | $ 3,078,007

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